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onsemi CS5231-3GDPR5
- Part No.:
- CS5231-3GDPR5
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
CS5231-3GDPR5.pdf
- Description:
- IC REG LINEAR 3.3V 500MA D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
CS5231-3GDPR5 from onsemi is a 500 mA, fixed 3.3 V linear regulator with integrated auxiliary supply control for dual-input power management. It delivers ±2.0% output accuracy, supports glitch-free switchover between 5.0 V main and 3.3 V auxiliary supplies, and meets Intel's "Instantly Available" power requirements per ACPI standards. It is used in PCI Network Interface Cards to maintain uninterrupted 3.3 V power to ASICs during system sleep transitions.
For engineers reviewing the CS5231-3GDPR5 datasheet, pinout, applications, or equivalent options, key selection considerations include VIN threshold hysteresis (75–125 mV), AuxDrv drive capability (10 mA sink / 50 mA source), reverse current limit (≤1.0 mA), thermal shutdown at 180°C with 25°C hysteresis, and D2PAK-5 package thermal resistance (RJA = 10–50°C/W).
Technical Context
The CS5231-3GDPR5 integrates a composite NPN-PNP pass transistor for low-dropout operation and low quiescent current (3.0 mA at 500 mA load). Its auxiliary control circuitry uses an internal 10 kΩ pull-up resistor and saturating NPN switch to drive the AuxDrv pin, enabling seamless transition between VIN and VAUX supply sources.
It implements voltage-controlled switchover with upper/lower VIN thresholds (4.35–4.65 V turn-on, 4.25–4.55 V turn-off), built-in current limiting (0.55–1.2 A), and reverse current protection (<1.0 mA when VIN = 0 V). The device requires ≥10 µF output capacitance with ESR < 1.0 Ω for stability and does not support remote sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2.0% - ensures stable ASIC core voltage within Intel ACPI-compliant systems |
| Max Output Current | 500 mA - sufficient for mid-power PCI NIC ASICs without external current boosting |
| Dropout Voltage | Not explicitly specified, but enabled by NPN-PNP composite pass transistor - reduces minimum VIN requirement vs. standard PNP designs |
| VIN Threshold Hysteresis | 75–125 mV - prevents oscillatory switching during slow-ramp or noisy input conditions |
| AuxDrv Sink/Source | 100 µA sink @ 0.4 V max / 50 mA source - directly drives gate of external PFET (e.g., MGSF1P02ELT1) without buffer |
| Reverse Current | ≤1.0 mA at VOUT = 3.3 V, VIN = 0 V - minimizes standby power loss and protects auxiliary rail integrity |
| Thermal Shutdown | 180°C activation with 25°C hysteresis - self-recovering fault protection without external reset |
Pinout & Package
D2PAK-5 (TO-263) package with exposed tab connected to GND; thermally optimized for surface-mount PCB heatsinking via soldered tab and leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connection - electrically isolated; no routing or bonding required |
| 2 | VIN | Main 5.0 V input supply - must stay within 4.75–6.0 V operating range for regulation |
| 3 & Tab | GND | Power ground and substrate reference - tab must be soldered to large copper pour for thermal management |
| 4 | VOUT | Regulated 3.3 V output - connects directly to load and output capacitor (≥10 µF, ESR < 1.0 Ω) |
| 5 | AuxDrv | PFET gate driver - pulled up to VIN via 10 kΩ; driven low when VIN < ~4.5 V to enable auxiliary supply path |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free dual-supply switchover | Enables zero-interruption 3.3 V power delivery during 5.0 V brownout or sleep-state entry on PCI NICs |
| Integrated VIN UVLO with hysteresis | Prevents chattering during marginal input conditions; 100 mV typical hysteresis eliminates need for external RC timing |
| Low reverse output current | ≤1.0 mA limits leakage into disabled VIN or ground rails - critical for battery-backed or always-on auxiliary domains |
| Thermal shutdown with hysteresis | 180°C trip + 25°C recovery margin allows autonomous fault recovery without system-level intervention |
| Internal fused leads (SOIC-8 variant only) | Not applicable to CS5231-3GDPR5 - this D2PAK-5 variant lacks internal fusing; fusing is exclusive to SOIC-8 DF package |
Applications
| PCI Network Interface Card (NIC) | Desktop Computer Power Management |
|---|---|
Use Scenario: System enters ACPI S3 Sleep State; 5.0 V rail drops below 4.4 V while 3.3 V auxiliary remains active. IC Role / Device Role / Timing Role: CS5231-3GDPR5 detects VIN drop, asserts AuxDrv low to turn on external PFET, and maintains uninterrupted 3.3 V to ASIC. Use Value: Eliminates power glitches that could corrupt NIC firmware state or trigger PCIe link retraining. |
Use Scenario: Motherboard VRM supplies 5.0 V to chipset, but auxiliary 3.3 V rail powers always-on logic during soft-off. IC Role / Device Role / Timing Role: CS5231-3GDPR5 acts as backup regulator, sourcing 3.3 V from auxiliary rail when main 5.0 V is absent. Use Value: Enables instant resume and wake-on-LAN functionality without requiring full system power restoration. |
| PCMCIA/ExpressCard Interface | Multi-Rail Industrial Control Module |
Use Scenario: Hot-plug insertion of PCMCIA card causes transient 5.0 V sag; auxiliary 3.3 V rail remains stable. IC Role / Device Role / Timing Role: CS5231-3GDPR5 switches output source from sagging 5.0 V to steady 3.3 V auxiliary within 1 µs response time. Use Value: Prevents card initialization failure or communication lockup during hot-swap events. |
Use Scenario: Programmable logic controller (PLC) module receives primary 5.0 V from switching supply and backup 3.3 V from supercapacitor bank. IC Role / Device Role / Timing Role: CS5231-3GDPR5 provides failover-regulated 3.3 V to FPGA configuration memory and real-time clock during AC loss. Use Value: Ensures deterministic state retention and graceful shutdown without data corruption or watchdog timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A6033QDGQRQ1 | Automotive-grade 3.3 V LDO (500 mA), no auxiliary control; requires external circuitry for dual-supply switchover | Lacks integrated AuxDrv logic - needs discrete comparator, MOSFET driver, and timing components to replicate CS5231-3GDPR5 function | Choose only if AEC-Q100 qualification is mandatory and system design can accommodate added complexity and board area |
| NCP1117ST33T3G | Fixed 3.3 V, 1 A LDO; no VIN monitoring, no auxiliary drive, no switchover capability | Single-input only - cannot manage auxiliary supply handoff; suitable only for static 5.0 V-to-3.3 V conversion | Select when cost sensitivity outweighs dual-rail functionality and system has no sleep-state or backup power requirements |
Compared with TPS7A6033QDGQRQ1 and NCP1117ST33T3G, the CS5231-3GDPR5 uniquely integrates both regulation and intelligent supply arbitration in one D2PAK-5 package - eliminating four to six external components and guaranteeing sub-microsecond switchover timing without layout-dependent delays.
Availability
CS5231-3GDPR5 is available at Aetrix Electronics and suitable for PCI interface cards, desktop motherboard power management, and industrial control modules requiring stable component supply with guaranteed long-term continuity.
Supply support for CS5231-3GDPR5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CS5231-3GDPR5 belongs to onsemi's legacy power management portfolio designed specifically for ACPI-compliant PC platforms and peripheral cards requiring reliable, glitch-free dual-rail power sequencing.
FAQ
What is the maximum input voltage rating for CS5231-3GDPR5?
The absolute maximum VIN rating for CS5231-3GDPR5 is 14 V, but its specified operating range is strictly 4.75 V to 6.0 V. Exceeding 6.0 V may cause excessive power dissipation and thermal shutdown, especially at full 500 mA load. The device is not rated for continuous operation above 6.0 V, even if below 14 V absolute maximum.
Does CS5231-3GDPR5 support remote output voltage sensing?
No, CS5231-3GDPR5 does not support remote sensing. Its feedback network is internal and inaccessible; output voltage regulation occurs at the VOUT pin. To minimize IR drop errors, place the IC adjacent to the load and use wide, low-resistance PCB traces for both VOUT and GND connections - especially critical in high-current or noise-sensitive applications.
What external PFET is recommended for use with CS5231-3GDPR5?
The datasheet specifies MGSF1P02ELT1 as the reference PFET for CS5231-3GDPR5. It features VGS(ON) ≈ 1.0 V and low RDS(ON), ensuring full enhancement with 3.3 V gate drive from the auxiliary rail. Its 130 mV VDS at 375 mA matches the application circuit's performance targets and avoids output voltage droop during switchover.
How does the AuxDrv pin behave during power-up and power-down sequences?
During power-up, AuxDrv remains low until VIN exceeds ~4.5 V, then pulls high after a 15 µs delay to turn off the PFET. During power-down, AuxDrv goes low when VIN falls below ~4.4 V, turning on the PFET to maintain VOUT. This controlled timing prevents cross-conduction and ensures monotonic, glitch-free transitions - verified in Figures 13–19 of the official datasheet.
Is CS5231-3GDPR5 RoHS compliant and lead-free?
Yes, CS5231-3GDPR5 is RoHS compliant and lead-free. The "G" in the part number denotes green (halogen-free, lead-free) packaging per onsemi's standard product marking convention. The D2PAK-5 package uses matte tin lead finish and complies with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) handling requirements.
CS5231-3GDPR5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 3 mA
- Current - Supply (Max):
- 6 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
CS5231-3GDPR5 FAQ
1.How can I place an order for CS5231-3GDPR5 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5231-3GDPR5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CS5231-3GDPR5 reliable?
The price and inventory of CS5231-3GDPR5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5231-3GDPR5 is usually 5 days.
3.What payment methods are accepted for CS5231-3GDPR5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5231-3GDPR5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5231-3GDPR5?
CS5231-3GDPR5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5231-3GDPR5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CS5231-3GDPR5?
For technical support, including CS5231-3GDPR5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5231-3GDPR5 requirements.
6.How does Aetrix verify that CS5231-3GDPR5 is sourced from the original manufacturer or authorized distributors?
All CS5231-3GDPR5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CS5231-3GDPR5 meets industry standards.
7.What is the process for return or replacement of CS5231-3GDPR5?
All CS5231-3GDPR5 units undergo pre-shipment inspection (PSI). If there is an issue with CS5231-3GDPR5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CS5231-3GDPR5 part is unused and in its original packaging.
Return procedure for CS5231-3GDPR5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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